BMW is teaming up with TomTom on GO LIVE Navigation, where you will see in the near future fitted in selected BMW 1 Series, 3 Series, X1 and X3 cars.
The unit will be installed as an auxiliary unit that will be mounted onto the car via an “Active Dock”.
You can still use the existing system to control this unit and will get GO LIVE services such as HD traffic, advanced lane guidance, Search & Go services and TomTom Places.
I think its really a good move, as TomTom is pretty established in GPS units and BMW can save on R&D.
Not sure if this is available in MY yet.